Composed of VMOS H bridge motor positive and negative drive circuit

Published:2011/6/7 19:48:00 Author:Fiona | Keyword: Composed of VMOS, H bridge motor, positive and negative drive | From:SeekIC

In the dual power optocoupler drive circuit scheme,use the output ofoptocoupler to direct-drive the MOS pipe, it would make the output waveform have a serious distortion,in particular the falling edge of the waveform is relatively slow, mainly caused by the capacitance between G and S of the MOS pipe. When the output waveform is high, charge to the capacitance between the G and S so that the wave increases slightly slow; when output waveform becomes low,the capacitance between G and S discharges through Rl to make the G of MOS pipe's potential decreasesvery slowly ,it leads to the the falling edge of the waveform has a serious distortion.



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